State police say an Armstrong County police department has received a letter threatening harm if charges are filed against Michelle Dibler, who was the driver in a March 18 crash that killed her 26-year-old sister.

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According to state police, the threat was made against the Parks Township Police Department.

However, state police said they're investigating the crash and that Parks Township police have never been involved in the investigation.

The sisters were driving home from Michelle Dibler's bachelorette party at the Addison House Restaurant & Lounge about 1 a.m. March 18 when the crash occurred, killing Nicole Dibler, 26.

Michelle Dibler, 23, said a car came the wrong way down a one-way side street and nearly collided with her vehicle on River Road, causing her to swerve, hit a pole and end up in the Kiski River.

Dibler said she tried but was unable to remove her sister, whose body was recovered by a police dive team.

Police said they believe Michelle Dibler was under the influence of alcohol, and possibly marijuana, but Dibler said any blame for the wreck should lie with the oncoming vehicle that forced her off the road.

"That car is the only reason I wrecked. It wasn't because of alcohol or drugs. It was that car," Dibler told Channel 4 Action News' Janelle Hall during a March interview. "I did, and I was drinking, but I wasn't drunk. I knew what I was doing."

Anyone with information about the letter has been asked to contact state police in Kittanning at 724-543-2011.